How To Make A 1-Port Cable Loss Measurement - Keysight A Series User Manual

CAT (Cable and Antenna Test) Mode
1-Port Cable Loss Measurements
A deteriorated cable is not usually apparent in a Distance to Fault
measurement, where more obvious and dramatic problems are identified. A
Cable Loss measurement is necessary to measure the accumulated losses
throughout the length of the cable.
A 2-port Insertion Loss measurement is usually more accurate than a 1-port
Cable Loss measurement. However, to perform a 2-port Insertion Loss
measurement, both ends of the cable must be connected to the FieldFox.
In high-loss conditions, a Cable Loss measurement becomes 'noisy' as the
test signal becomes indistinguishable in the FieldFox noise floor. This can
occur when measuring a very long cable and using relatively high
measurement frequencies. To help with this condition, use High Power
(page

How to make a 1-port Cable Loss Measurement

1. Press Preset then Preset.
2. Then
3. Connect the cable to be tested.
4. Press Freq/Dist and enter
5. Press Sweep 3 then
6. Remove the cable to be tested.
7. Press Cal 5, then
QuickCal is only available on N991xA/2xA/3xA models.
8. Follow the prompts to perform calibration at the end of the jumper cable
9. Connect the cable to be tested.
Low-level standing waves (also known as 'ripple') which may be visible in
reflection measurements, can hide the actual loss of the cable. Steps 10
through 13 can minimize the ripple. Perform the measurement with and
without steps 10 through 13 and choose the method with the least amount
of ripple.
70
67) and Averaging
More then Cable Loss (1-Port)
measurement.
Min Swp
trace is visible on the screen. The amount of time that is required increases
with longer cable lengths. Learn more in the Supplemental Online Help at:
(https://www.keysight.com/us/en/lib/resources/service-manuals/keysigh
t-fieldfox-library-help-and-manuals-2153870.html
Library, Help and Manuals – FieldFox Online Supplemental Help).
QuickCal
or adapter. Learn more about Calibration in
Calibration" on page 137
(page 64).
Start and Stop frequency values of the
Time. Increase the Sweep Time until a stable
or Mechanical Cal.
"How to Perform a
Keysight N9927-90020 User's Guide
Keysight FieldFox